Seen couple of UFO's (Unidentified Flying Objects that is, not flying saucers) myself but can't really tell if they were just earthlings with their machines or visitors from space.
Anyway.. when it comes to some advanced extra-terrestrial lifeform that might be checking us out, I believe we'd know about it as much as ants would know about the little microcamera David Attenborough inserts in to their nest.
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